To reconstruct the climatic and paleoceanographic variability offshore Northeast Greenland during the last ~10 ka with multidecadal resolution, sediment core PS93/025 from the outermost North-East Greenland continental shelf (80.5°N) was studied by a variety of micropaleontological, sedimentological and isotopic methods. High foraminiferal fluxes, together with high proportions of ice-rafted debris and high Ca/Fe ratios, indicate a maximum in bioproductivity until ~8 ka related to a low sea-ice coverage. Sortable silt values, planktic foraminifer associations, and stable isotope data of planktic and benthic foraminifers suggest a strong westward advection of relatively warm Atlantic Water by the Return Atlantic Current during this time, with a noticeable bottom current activity. This advection may have been facilitated by a greater water depth at our site, resulting from postglacial isostatic depression. For the following mid-Holocene interval (ca. 8–5 ka), isotope data, lower foraminiferal fluxes and a shift in grain size maxima point to a lasting but successively decreasing Atlantic Water inflow, a weakening productivity, and a growing sea-ice coverage which is also revealed by the PIIIIP25 index. A final stage in the environmental development was reached at ~5 ka with the establishment of pre-industrial conditions. Low Ca/Fe ratios, low foraminiferal fluxes, low sortable silt values and the sea-ice indicating PIIIIP25 index point to a limited productivity and a weak Atlantic Water inflow by the Return Atlantic Current to our research area, as well as a higher and/or seasonally more extended sea-ice coverage during the Late Holocene. Two intervals with somewhat enhanced Atlantic Water advection around 2.0 and 1.0 ka are indicated by slightly increased foraminiferal fluxes and the reoccurrence of subpolar foraminifers. These intervals may correlate with the Roman Warm Period and the Medieval Climate Anomaly, as defined in the North Atlantic region.

中文翻译：

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过去 10,600 年间格陵兰东北部（弗拉姆海峡西部）的环境变化

为了以数十年的分辨率重建格陵兰东北部近海过去~10 ka 的气候和古海洋变化，通过各种微古生物学、沉积学和同位素研究了格陵兰东北部最外层大陆架（80.5°N）的沉积物核心 PS93/025方法。高有孔虫通量，加上高比例的冰筏碎片和高 Ca/Fe 比率，表明生物生产力最高，直到约 8 ka 与低海冰覆盖率相关。可分类的淤泥值、浮游有孔虫关联以及浮游和底栖有孔虫的稳定同位素数据表明，在此期间，返回大西洋海流对相对温暖的大西洋水进行了强烈的西向平流，底部流活动明显。这种平流可能是由我们站点的更大水深促进的，这是由冰后等静压洼地造成的。在接下来的全新世中期（约 8-5 ka），同位素数据、较低的有孔虫通量和粒度最大值的变化表明大西洋水流入持续但连续减少、生产力减弱和海冰增加PIIIIP25 指数也显示了覆盖范围。随着前工业条件的建立，环境发展的最后阶段在~5 ka 时达到。低 Ca/Fe 比率、低有孔虫通量、低可分选淤泥值和指示 PIIIIP25 指数的海冰表明生产力有限且大西洋水流入我们研究区的回流大西洋水较弱，以及全新世晚期更高和/或季节性更广泛的海冰覆盖。在 2.0 和 1.0 ka 附近大西洋水平流略有增强的两个间隔由有孔虫通量略有增加和次极地有孔虫的重现表明。这些间隔可能与北大西洋地区定义的罗马暖期和中世纪气候异常相关。